Changing System Currency & Foreign Currency - One time settings

A client has been using SAP-B1 Hanna since 2015. The one time currency setting was agreed to be the same (Ethiopian Birr) for all local currency, system currency and foreign currency during the implementation. These settings are one time setting and can only be changed before any transactions are recorded. However, the company has been using the system for over three years. Currently the organization's need has changed and it wants to generate financial reports in both US dollars(Foreign Currency) and Ethiopian birr (Local Currency). Is there any way to change this setting, so that the organization can generate financial reports in two different currencies mentioned above? (i.e. to change the current setting for Foreign currency from Ethiopian Birr to US dollars?) Thank you in advance!!